Merge pull request #1729 from mdipirro/scala-372-context-functions

SCALA-372 Add code for context functions article

Author: dominiqueplante

build.sbt

@@ -680,6 +680,12 @@ lazy val scala_lang_4 =
     scalaVersion := scala3Version
   )
 
+lazy val scala_lang_5 =
+  (project in file("scala-lang-modules/scala-lang-5")).settings(
+    libraryDependencies ++= scalaTestDeps,
+    scalaVersion := scala3Version
+  )
+
 lazy val cats_effects = (project in file("cats-effects"))
   .settings(
     name := "cats-effects",

scala-lang-modules/scala-lang-5/src/main/scala/com/baeldung/scala/contextfunctions/Examples.scala

@@ -0,0 +1,36 @@
+package com.baeldung.scala.contextfunctions
+
+val increment: Int ?=> Int = summon[Int] + 1
+
+val repeatString: String ?=> Int ?=> String = summon[String].repeat(summon[Int])
+
+opaque type WrappedAlso[T] = T
+
+def it[T](using a: WrappedAlso[T]): T = a
+
+extension [T](x: T)
+  def also(f: WrappedAlso[T] ?=> Unit): T =
+    f(using x)
+    x
+
+@main
+def main(): Unit = {
+  // Implicit parameter provided via the scope
+  given Int = 1
+  println(s"Result scope: $increment")
+
+  // Implicit parameter provided explicitly to the call
+  println(s"Result explicit: ${increment(using 5)}")
+
+  println(s"Result repeatString: ${repeatString(using "Baeldung")(using 3)}")
+
+  val numbers = List(1, 2, 3, 4, 5)
+  numbers
+    .also(println(s"The list before adding 6: $it"))
+    .appended(6)
+    .also(println(s"The list after adding 6: $it"))
+
+  numbers
+    .also(it appended 7)
+    .also(println(s"The list after adding 7: $it"))
+}